package com.rzjm.exercise.common.utils.encryp.impl;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.Security;
 
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;

import com.rzjm.exercise.common.exception.EncrypException;
import com.rzjm.exercise.common.utils.encryp.Encryp;

public class EncrypDES3 implements Encryp {
 
	// KeyGenerator 提供对称密钥生成器的功能，支持各种算法
	private KeyGenerator keygen;
	// SecretKey 负责保存对称密钥
	private SecretKey deskey;
	// Cipher负责完成加密或解密工作
	private Cipher c;
 
	public EncrypDES3() {
		Security.addProvider(new com.sun.crypto.provider.SunJCE());
		try {
			// 实例化支持DES算法的密钥生成器(算法名称命名需按规定，否则抛出异常)
			keygen = KeyGenerator.getInstance("DESede");
			// 生成密钥
			deskey = keygen.generateKey();
			// 生成Cipher对象,指定其支持的DES算法
			c = Cipher.getInstance("DESede");
		} catch (NoSuchAlgorithmException | NoSuchPaddingException e) {
			throw new EncrypException(e);
		}
	}
 
	@Override
	public String encrytor(String str) {
		try {
			// 根据密钥，对Cipher对象进行初始化，ENCRYPT_MODE表示加密模式
			c.init(Cipher.ENCRYPT_MODE, deskey);
			return toEncodedString(c.doFinal(str.getBytes(charset)));
		} catch (InvalidKeyException | IllegalBlockSizeException | BadPaddingException e) {
			throw new EncrypException(e);
		}
	}
 
	@Override
	public String decryptor(String str) {
		try {
			// 根据密钥，对Cipher对象进行初始化，DECRYPT_MODE表示加密模式
			c.init(Cipher.DECRYPT_MODE, deskey);
			return toEncodedString(c.doFinal(str.getBytes(charset)));
		} catch (InvalidKeyException | IllegalBlockSizeException | BadPaddingException e) {
			throw new EncrypException(e);
		}
	}
 
	/**
	 * @param args
	 */
	public static void main(String[] args) throws Exception {
		Encryp des = new EncrypDES3();
		String msg ="搞笑相声全集";
		String encontent = des.encrytor(msg);
		String decontent = des.decryptor(encontent);
		System.out.println("明文是:" + msg);
		System.out.println("加密后:" + encontent);
		System.out.println("解密后:" + decontent);
 
	}
 
}
